Download Android Jelly Bean 4.2.2 stock firmware for Himedia Q15 TV Box from here or here. Download another Himedia firmware from here.
Archive name: update_dualcore_Q15
Archive file size: 261 MB
Image file: update_dualcore_Q15_emmc.zip
Firmware: Android Jelly Bean 4.2.2 stock firmware
Model: Himedia Q15 TV Box
Build number: HiSTBAndroidV5/Hi3718CV100/Hi3718CV100:4.2.2/HMD-1.0.5/2014-01-10.165223:eng/test-keys